CN215297655U

CN215297655U - Laser radar optical window

Info

Publication number: CN215297655U
Application number: CN202120985802.8U
Authority: CN
Inventors: 肖亮; 姚立; 刘守军
Original assignee: Wuhan Laide Intelligent Technology Co ltd
Current assignee: Wuhan Laide Intelligent Technology Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-12-24
Anticipated expiration: 2031-05-10

Abstract

The utility model relates to a laser radar technical field refers in particular to a laser radar optical window, including window mirror assembly, window mirror assembly forms through the concatenation of a plurality of rectangle form window substrates that the piece size is the same, and the working face of window mirror assembly is the right angle with the angle between the upper and lower terminal surface, and angular bisector position between two adjacent rectangle form window substrates is fixed with rectangle form separation blade. The window mirror assembly is formed by splicing a plurality of rectangular window substrates with the same size, the production and processing of the rectangular window substrates and the splicing process between two adjacent rectangular window substrates are simplified, the cost is reduced, better splicing quality can be achieved, the problem that oblique edges cannot be aligned after splicing is avoided, the upper end face and the lower end face of the rectangular window substrates generate end difference is solved, the working efficiency of the splicing process is improved, the rectangular separation blade is used for blocking secondary reflected light of the inner wall of the window mirror from going to a detector in a system ranging module, a false alarm is formed, and even the detector breakdown is caused.

Description

Laser radar optical window

Technical Field

The utility model relates to a laser radar technical field refers in particular to a laser radar optical window.

Background

The linear scanning laser radar is one laser radar for collecting two-dimensional section target and its scanner consists of mainly driver, scanning reflector and window mirror. The driver is an actuating mechanism which generates periodic motion, usually a direct current motor, the scanning reflector is usually a 45-degree reflector, the 45-degree reflector rotates under the driving of the direct current motor, a one-dimensional light beam emitted by the distance measuring module is projected to a two-dimensional cross section, and the window mirror is used for enabling the emergent laser and the target return light to leave or enter the system through the window mirror so as to isolate the system from the external environment. Although the window mirror only plays a role in isolating the interior of the system from the external environment in the laser radar scanning device, the structural form and performance indexes of the window mirror are very critical, and the adverse effect of the window mirror on the system can be reduced to the maximum extent due to excellent optical performance and reasonable layout. The following points must be considered in the selection of the window mirror solution: 1) when emergent light passes through the window mirror, a small part of the emergent light is reflected back to the inside of the system to form stray light; 2) the layout direction of the window mirror can determine the direction of reflecting stray light, and the layout of the window mirror must ensure that no matter the scanning reflector rotates to any phase, the stray light cannot enter the receiving optical detector, otherwise, the detector can receive wrong signals to form false alarms, and even the detector is broken down; 3) the difficulty of manufacturing the window mirror, the difficulty of gluing the assembly and the overall cost for achieving the technical specifications are taken into consideration.

At present, window mirrors on the market have two types of annular glass covers and inclined window mirrors, the scheme of the annular glass cover is an integrated window mirror, the cross section of the window mirror is in a circular ring shape, and the window mirror has the following defects: 1) the film coating process of the annular glass cover is very difficult; 2) the manufacturing of the annular glass cover is integrated process forming, the process links of forming, polishing and the like all need special equipment, and in order to ensure that the annular glass cover meets the design index, the manufacturing and the process of the annular glass cover pay huge cost and cost. The inclined window mirror adopts a plurality of flat mirrors to be glued to form a tower-shaped structure, compared with an annular glass cover, the splicing scheme of the inclined window mirror adopts the flat mirrors as bonding substrates, the manufacturing process of the flat mirrors is mature, but the inclined window mirror still has the following defects: 1) in order to form a tower-shaped structure with an angle of 3 degrees after four substrates are bonded, the four end surfaces of the substrates except two working surfaces are chamfered, the end surfaces on the left side and the right side are not only required to form an angle with the working surfaces, but also required to form an angle with the upper end and the lower end, and are dihedral angles, so that the processing of the substrates is greatly challenged, especially the control difficulty of size consistency is very high, if the chamfered sizes of the four substrates are inconsistent, the four chamfered edges cannot be aligned after the four substrates are spliced, and the top surface and the bottom surface have end difference; 2) the splicing scheme of the inclined window mirror is difficult in the splicing and gluing process after four substrates are processed, and because the splicing assembly is of a tower-shaped structure with an angle of 3 degrees, each substrate needs to be obliquely placed at an accurate spatial position in the splicing process, so that the peripheral inclined edges are aligned in pairs, and meanwhile, the top surface and the bottom surface are aligned, which provides a high requirement for the positioning precision of the positioning device. Therefore, the substrate beveling process and splicing difficulty of the inclined window mirror splicing scheme are high. Although the state meeting the technical indexes is possible to achieve by the current technical capability, the cost is high, meanwhile, the yield of the substrate is poor, and the production efficiency of the splicing gluing process is low, which is the main problem of the scheme.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a laser radar optical window effectively solves the not enough of prior art.

In order to achieve the above purpose, the utility model discloses the technical scheme who uses as follows:

the laser radar optical window comprises a window mirror assembly, wherein the window mirror assembly is formed by splicing a plurality of rectangular window substrates with the same size, the angle between the working surface and the upper and lower end surfaces of the window mirror assembly is a right angle, and rectangular blocking pieces are fixed at the angular bisector positions between two adjacent rectangular window substrates.

According to the scheme, the end faces of the two ends of the rectangular window substrate are chamfered by 45 degrees.

According to the scheme, antireflection films are plated on the surfaces of the inner wall and the outer wall of the rectangular window substrate.

According to the scheme, the rectangular window substrates with the same size are fixedly bonded in a glue bonding mode.

According to the scheme, the rectangular blocking pieces are fixedly bonded at the joint between the two adjacent rectangular window substrates in a glue bonding mode.

According to the scheme, the surface of the rectangular baffle plate is coated with the adsorption coating of the working light wave band.

According to the scheme, the thickness of the rectangular baffle plate is 0.2 mm.

According to the scheme, the rectangular window substrate is made of a light-permeable plane mirror, and the rectangular blocking piece is made of a metal piece, a plastic piece or other light-impermeable materials.

According to the scheme, the window mirror assembly is arranged in a hollow structure.

The utility model discloses beneficial effect:

1) the window mirror assembly is formed by splicing a plurality of rectangular window substrates with the same size, the production and processing of the rectangular window substrates and the splicing process between two adjacent rectangular window substrates are simplified, the cost is reduced, better splicing quality can be achieved, the phenomena that oblique edges cannot be aligned and end differences are generated on the upper end surface and the lower end surface after splicing are avoided, and the working efficiency of the splicing process is further improved;

2) the rectangular blocking sheet is fixed at the angular bisector position between two adjacent rectangular window substrates, so that the effect of the rectangular blocking sheet is that when emergent light passes through the window mirror, the secondary reflection of the inner wall of the window mirror is prevented from returning to the inside of a system to form stray light, and the secondary reflection of the inner wall of the window mirror can be prevented from going to a detector in a system ranging module to form false alarm, even the detector is broken down;

3) the rectangular window substrate and the rectangular separation blade are simple to manufacture, low in gluing assembly difficulty and low in cost.

Drawings

FIG. 1 is an elevation view of the overall structure of the present invention;

FIG. 2 is a front view of the overall structure of the present invention;

FIG. 3 is a top view of the overall structure of the present invention;

FIG. 4 is a front view of a rectangular window substrate according to the present invention;

FIG. 5 is a top view of a rectangular window substrate according to the present invention;

fig. 6 is a working principle diagram of the rectangular baffle plate of the present invention.

1. A rectangular window substrate; 2. a rectangular baffle plate; 3. a scanning mirror; 4. primary reflected light;

Detailed Description

The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.

As shown in fig. 1 to 6, a laser radar optical window, including window mirror assembly, window mirror assembly forms through the concatenation of a plurality of rectangle form window substrates that the piece size is the same, and the working face of window mirror assembly is the right angle with the angle between the upper and lower terminal surface, and the angular bisector position between two adjacent rectangle form window substrates is fixed with rectangle form separation blade. The above structure constitutes the basic structure of the utility model.

The utility model adopts the structure, the window mirror assembly is formed by splicing a plurality of rectangular window substrates 1 with the same size, the production and processing of the rectangular window substrates 1 and the splicing process between two adjacent rectangular window substrates 1 are greatly simplified, the cost is reduced, better splicing quality can be achieved, the phenomenon that the inclined edges can not be aligned after splicing and the end difference between the upper end surface and the lower end surface is generated is avoided, the working efficiency of the splicing process is further improved, meanwhile, compared with the splicing scheme of the inclined window mirror, the window mirror assembly of the utility model does not need to be manufactured into a tower-shaped structure with an inclined angle, the angle between the working surface and the upper end surface and the lower end surface is a right angle, a rectangular separation blade 2 is fixed at the position of the angle bisector between two adjacent rectangular window substrates 1, the rectangular separation blade 2 has the function of emergent light when passing through the window mirror, the secondary reflection of the inner wall of the window mirror is prevented from returning to the interior of the system to form stray light, and the secondary reflection of the inner wall of the window mirror can be prevented from going to a detector in the system ranging module to form a false alarm, even the detector is broken down.

In practical application, when the scanning reflecting mirror 3 rotates to a position near the joint of the spliced window mirror assembly, emergent light forms primary reflected light 4 on the inner wall of the left window mirror, but the primary reflected light 4 is stopped by the rectangular blocking piece 2 before reaching the window mirror above, secondary reflection cannot be formed, and the problem that secondary reflected light on the inner wall of the window mirror returns to the detector in the prior art is solved.

In practical application, the rectangular window substrate 1 and the rectangular baffle piece 2 are adopted, the geometric dimension is easy to control, the surface shape precision is easy to guarantee, special equipment is not needed in the processing process, the manufacturing is simpler, and the cost is low.

In this embodiment, the end faces of both ends of the rectangular window substrate 1 are chamfered at 45 degrees. By adopting the structure, the two adjacent rectangular window substrates 1 are convenient to bond, compared with an inclined window mirror, the two-sided angle is adopted, the chamfering processing is simpler, the size precision is easier to guarantee, the single rectangular window substrate 1 is easy to position to the accurate space position, and the splicing and gluing efficiency is high.

In this embodiment, antireflection films are plated on the inner wall and the outer wall of the rectangular window substrate 1. By adopting the structure, the light transmittance of the rectangular window substrate 1 is convenient to improve, the ranging capability of the system is ensured, the coating process is simple, and the coating quality is easy to ensure.

In this embodiment, the rectangular window substrates 1 with the same size are fixedly bonded by glue. By adopting the structure, the splicing among the rectangular window substrates 1 with the same size is very convenient, and the working efficiency in the splicing process is high.

In this embodiment, the rectangular blocking sheet 2 is fixedly bonded to the seam between two adjacent rectangular window substrates 1 by glue bonding. By adopting the structure, the rectangular separation blades 2 can be spliced conveniently, and the working efficiency of the splicing process is high.

In this embodiment, the surface of the rectangular baffle plate 2 is coated with an adsorption coating of the operating optical band. Adopt such structure setting, through the adsorption coating that has the working light wave band on the surface coating of rectangle form separation blade 2, and then play the function of blockking 4 of once reverberation, avoid forming the secondary reflection light.

In this embodiment, the thickness of the rectangular baffle plate 2 is 0.2 mm. By adopting the structure, the manufacturing is simple and the cost is low.

In this embodiment, the rectangular window substrate 1 is made of a transparent plane mirror, and the rectangular blocking piece 2 is made of a metal piece, a plastic piece or other opaque materials. By adopting the structure, the utility model has the advantages of simple manufacture, convenient material drawing and low cost.

In this embodiment, the window mirror assembly is provided in a hollow structure. By adopting the structure, the scanning reflecting mirror can be driven by the driving device to rotate in the window mirror assembly conveniently.

It should be noted that, the window mirror assembly of the present invention can be formed by bonding 4 substrates with the same size, as shown in fig. 1, but not limited to, 5, 6 or more substrates can be bonded, and 3 substrates can be bonded.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and these forms are within the scope of the present invention.

Claims

1. A laser radar optical window, includes window mirror assembly its characterized in that: the window mirror assembly is formed by splicing a plurality of rectangular window substrates (1) with the same size, the angle between the working surface and the upper and lower end surfaces of the window mirror assembly is a right angle, and rectangular blocking pieces (2) are fixed at the angular plane division line positions between every two adjacent rectangular window substrates (1).

2. A lidar optical window according to claim 1, wherein: and the end faces of two ends of the rectangular window substrate (1) are chamfered by 45 degrees.

3. A lidar optical window according to claim 1, wherein: antireflection films are plated on the surfaces of the inner wall and the outer wall of the rectangular window substrate (1).

4. A lidar optical window according to claim 1, wherein: the plurality of rectangular window substrates (1) with the same size are fixedly bonded in a glue bonding mode.

5. A lidar optical window according to claim 1, wherein: the rectangular separation blades (2) are fixedly bonded at the joint between the two adjacent rectangular window substrates (1) in a glue bonding mode.

6. A lidar optical window according to claim 1, wherein: the surface of the rectangular baffle plate (2) is coated with an adsorption coating of a working light wave band.

7. A lidar optical window according to claim 1, wherein: the thickness of the rectangular baffle plate (2) is 0.2 mm.

8. A lidar optical window according to claim 1, wherein: the rectangular window substrate (1) is made of a light-permeable plane mirror, and the rectangular blocking piece (2) is a metal piece or a plastic piece.

9. A lidar optical window according to claim 1, wherein: the window mirror assembly is arranged in a hollow structure.